Hydraulic pressure delivery device



May 27, 1952 V T. ROZANSKI ET AL HYDRAULIC PRESSURE DELIVERY DEVICEFiled 0011.25, 1945 7 7 I 0 fioz na/r/l W////am W/f/qy,

, INVENTORS Patented May 27, 1952 UNITED STATES PATENT OFFICE HYDRAULICPRESSURE DELIVERY DEVICE Tony Rozanski' and William Whitley, Ramsey, N.J.

Application October 23, 1945, Serial No. 624,070

(Cl. Gil-54.6)

2 Claims. 1

This invention relates to hydraulically operated tools, and moreparticularly to a hydraulic pressure delivery device for supplying thetools with liquid under pressure for their operation, the primary objectof the invention being to provide a simple and practical device of thischaracter which can be constructed, operated and serviced at relativelylow cost.

Another important object of the invention is to provide a device of thecharacter indicated above which is particularly suited to being drivenfrom power take off devices of the types which are generally available.

With the foregoing and other objects and advantages in view, theinvention consists of the novel construction and arrangement of partshereinafter described and claimed.

In the accompanying drawing showing an illustrative embodiment of theinvention:

Figure 1 is a side elevation, partly in longitudinalsection, of apowered wood saw assembly.

Figure 2 is a vertical transverse section taken through the powertake-off driven pressure producing assembly for operating the saw, and,

Figure 3 is a fragmentary top plan view of the saw assembly showing thesame in relation to a log to be sawed.

Referring in detail to the drawing, wherein like numerals designatesimilar parts throughout, the saw assembly, generally designated A,comprises a forwardly elongated frame I, comprising upper and lower;longitudinal members 2 and 3, respectively, connected and spaced attheir rear ends by astrut 4 and having a similar connecting member 5adjacent their forward ends, acting as handholds. Another strut 6,connecting the for ward ends of the longitudinal members 2 and 3 haspivoted thereon at 1 a pointed log impaling rod 3.

The lower longitudinal frame member 3 is in the form of a hydrauliccylinder closed at its forward end and having a hydraulic hose 9connected to its rearward end, a shut-ofi valve having a trigger leverHi being provided near the rear strut 4, so that the valve can bereadily operated by a hand engaged with the strut 4.

A hydraulic piston H operates in the lower cylinder member 3 and has apiston rod l2 working through the forward end of the cylinder. The upperframe member 2 is formed with a bore l3 parallel to the piston rod l2,in which slides a guide rod M which works through the forward end ofthebore l3. Fixed to the forward ends of .the s1idabl uide rod l4 andpiston rod I2 is a right angular saw holder bar I5, whose forward sideis slotted at IE to receive the rear end of a straight saw I1, suitablesaw securing means l8 being provided to hold the saw assembled with theholder bar. The holder bar depends below thes aw frame I and has a lugl5 on its lower end to which is connected one end of a retracting springI9 having its opposite end anchored to a lug 20 on the lower framemember 3, whereby the saw is normally retracted to a position in whichthe piston I l is at the rearward end of the cylinder member 3, as shownin Figure 1.

The saw is operated by admitting fluid under pressure behind the pistonH from the hoses by operating the valve lever l0 until the saw I! hasbeen projected forwardly from the tarting position shown in Figure 1,whereupon thevalve lever I0 is operated in the opposite direction tovent the fluid pressure behind the piston ll, through the vent port 2|provided at the rear end of the cylinder member 3, so that the spring [9can retractthe saw to the starting position. Hepeated strokes of the saware produced by repeating these operations as often as desired. As shownin Figures 1 and 3,- the saw I1 is aided in its engagement with the log22 or the like to be sawed; by impaling the impaling rod 8 in the logalongside of the path of movement of the saw.

The pressure producing assembly B comprises a hydraulic fluid containingcasing 23 having a removable plate-like top 24, provided with twolaterally spaced open cylinders 25 and 26, respectively,- provided attheir upper ends with hydraulic seals 2-1, 21 and opening at their lowerends into the casing 23. A working piston 28 is reciprocable in thecylinder 25 and a pressure-responsive piston 29 is reciprocable in thecylinder 25.

The pressure responsive piston 29 has a rigid piston rod 30 projectingupwardly therefrom and connected to the middle of a cros'shead 3 I.Contractile springs 32 32 are stretched between the ends of thecr'osshead on opposite sides of the piston rod 3!! and the casing top24, whereby the piston 29 is urged in a downward direction, but canyield upwardly whenever pressure within the casing 23 exceeds thecombined strength of the springs 32, 32

For working the piston 28 a connecting rod 33 is provided which ispivotally connected to the piston at 34 and is journalled at 35 on acrank throw 36 on a crankshaft 31 which is journalled in the upper endsof standards 38, 38 which rise at and are connected at 39 with theopposite ends of the casing 23.

saw assembly A, so as to supply the same with fluid pressure for itsoperation. The piston 29 normally depends within the casing 23, is shownin Figure 2, due to the action of the springs 32, 32,

thereby occupying a corresponding amount of cubic space therein.However, as pressure is built up in the casing by the operation of thepiston 28, beyond the holding strength of the springs 32, 32 the piston29 will rise against the resistance of the springs, thereby to acorresponding extent relieving the pressure within the casing. Byproperly choosing the components involved, including the springs, thepiston 29 may be made to serve to relieve any expected excess pressurein the casing 23 in the manner indicated, and at the same time serve asa visual indicator of any unusual rise in such pressure, since anunusual rise of the cross head 3| above the casing top 24 is readilyperceptible.

Having thus described our invention what we claim as new and desire tosecure by Letters Patent is:

1. A hydraulic pressure delivery device comprising a hydraulic fluidcontaining casing having a closed top, a first open ended cylinderfixedly supported in said closed top and having one end in communicationwith the interior of said casing and havingthe other end projectingbeyond said closed top, a first piston mounted in said cylinder forreciprocatory movement and having one end adjacent said one end of saidcylinder and having the other end extending beyond said other end ofsaid cylindena rotatable crankshaft having a crank throw intermediateits ends arranged exteriorly of and supported on said casing, aconnecting rod having one end connected to the other end of said pistonand havingthe other end connected to said crank throw, a second openended cylinder spaced from said first cylinder andfixedly supported insaid closed top and having one end in communication with the interior ofsaid casing and having the other end projecting beyond said closed top,a second piston mounted in said second cylinder for reciprocatorymovement and having one end adjacent said one end of the latter namedcylinder and having the other end extending beyond said other end ofsaid second cylinder, means resiliently connecting said second piston tosaid closed top casing, an outlet connected to said casing for conveyingfluid under pressure from said casing, and means connected to saidcrankshaft for effecting the rotation of the latter to thereby causereciprocation of said first named piston to exert pressure on the fluidin said casing and force said liquid under pressure out of said outlet.

2. A hydraulic pressure delivery device comprising a hydraulic fluidcontaining casing having a closed top, a first open ended cylinderfixedly supported in said closed top and having one end in communicationwith the interior of said casing and having the other end projectingbeyond said closed top, a first piston mounted in said cylinder forreciprocatory movement and having one end adjacent said one end of saidcylinder and having the other end extending beyond said other end ofsaid cylinder, a rotatable crankshaft having a crank throw intermediateits ends arranged exteriorly of and supported on said casing, aconnecting rod having one end connected to the other end of said pistonand having the other end connected to said crank throw, a second openended cylinder spaced from said first cylinder and fixedly supported insaid closed top and having one end in communication with the interior ofsaid casing and having the other end projecting beyond said closed top,a second piston mounted in said second cylinder for reciprocatorymovement and having one end adjacent said one end of the latter namedcylinder and having the other end extending beyond saidother end of saidsecond cylinder, a crosshead arranged adjacent to and spaced from saidother end of said second piston and secured to the latter, resilientmeans operatively connected to said crosshead and said closed casing topfor urging said second piston into the interior of 'said.

casing, an outlet connected to said casing "for conveying fluid underpressure from said casing, and means connected to said crankshaft foreffecting the rotation of the latter to thereby cause reciprocation ofsaid first named piston to exert pressure on the fluid in said casingand force said liquid under pressure out of said outlet.

TONY ROZANSKI. WILLIAM WHITLEY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 279,967 Merrill June 26, 1883386,116 Du Bois July 17, 1888 610,230 Dow Sept. '6, 1898 731,241Steinger June 16, 1903 763,833 Albree June 28, 1904 1,543,841 GrigoleitJune 30, 1925 1,694,951 Reynolds Dec. 1 1, 1928 1,704,641 Weed Mar. 5,1929 1,881,185 Hazelton Oct. 4, 193-2 2,098,653 Carroll Nov. 9; 1937 72,114,241 Tosten Apr. 12, 1938 2,168,806 Reilly Aug. 8, 1939 2,214,922Ericson Sept. 17, 1940 2,414,519 Greene Jan. 21-, 1947 FOREIGN PATENTSNumber Country Date 191,783 Great Britain Jan. 22, 1923 400,67?

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